- His original Timmy outfit is in the Smithsonian Institution next to the Fonz's leather jacket and Archie Bunker's chair.
- Still remains close to his former Lassie (1954) co-star June Lockhart.
- Met and later married first wife Sandy after backing his car into her car by chance. They had a son and a daughter. They subsequently divorced.
- In 1989, he worked in an episode of The New Lassie (1989) starring Wendy Cox, which reunited him with original Lassie (1954) co-star June Lockhart.
- Revealed that he had a wonderful relationship with June Lockhart on Lassie (1954).
- His father was an aeronautical engineer; his mother accompanied him on the set and was paid a salary plus expenses for being with him. Brother Bill occasionally appeared in small roles on Lassie (1954).
- His father urged him to go to college. Jon attended Sonoma State University north of San Francisco. He initially sold real estate in the area.
- Wrote a column for "Fido Friendly" magazine called Your Canine Connection.
- Served on the Board of Directors for Canine Companions for Independence, a non-paid position he held for more than 25 years. Among his many awards was one presented by the Motion Picture Council for his dedication in helping the physically challenged.
- The youngest actor to ever star in a television series, seven-year-old Jon was hand-picked--he never tested for the role--by Lassie (1954) producer Bonita Granville on the strength of his work in Escapade in Japan (1957) at the age of six.
- In 1970, he departed from Hollywood, at 20 years old, after filming Disney's sci-fi comedy The Computer Wore Tennis Shoes (1969).
- He was awarded a Star on the Hollywood Walk of Fame for Television at 7080 Hollywood Boulevard in Hollywood, California on February 1, 1994.
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